The following properties are associated with predicates either implicitly or by declaration:
As of release 4.2, the SkeletalGoal will contain
the specifications used in the original meta-declaration.
Every predicate has exactly one of the properties
[built_in, compiled, interpreted, fd_constraint],
at most one of the properties
zero or more
and at most one of the remaining properties.
To query these associations, use
reference page contains several examples.